Why was Operation Polo decisive in Hyderabad's integration with India?

Correct answer: It ended the Nizam's policy of remaining separate

Operation Polo was decisive because it ended the Nizam’s attempt to keep Hyderabad outside the Indian Union. Before the operation, negotiations and political efforts had not produced a final integration, and the situation remained unsettled. The action brought the authority of the Indian government over the state and made accession possible. It is commonly described as a police action, though it involved the Indian armed forces, and it took place in September 1948.

After the operation, the Nizam’s separate policy could no longer continue, and Hyderabad became part of India. Thus, option A correctly states its importance. The other choices refer to entirely different events: Bengal’s partition, the Simon Commission, and the breaking of the salt law. None of them explains Hyderabad’s integration. The question tests the connection between a specific historical action and the political outcome that followed it.